Predator (cat hair)-induced enhancement of hippocampal long-term potentiation in rats: involvement of acetylcholine

Extensive literature has demonstrated that arousal and fear modify memory acquisition and consolidation. Predator hair and odors increase arousal in rats and, therefore, may influence information encoding and synaptic plasticity in the rodent nervous system. In behavioral experiments, we confirm that laboratory-bred Long Evans rats avoid cat hair. Electrophysiological work in vivo showed that long-term potentiation (LTP) in the dentate gyrus induced by perforant path stimulation was enhanced for 5-7 days when LTP induction occurred in the presence of cat hair relative to fake hair. The muscarinic receptor antagonist scopolamine (i.p.) reversed the cat hair-elicited LTP enhancement without affecting weaker LTP elicited in the presence of fake hair. Thus, exposure to a predator stimulus elicits a cholinergically-dependent state of heightened plasticity that may serve to facilitate information storage in hippocampal circuits.     

The effect of dehydroepiandrosterone (DHEA) on recognition memory decision processes and discrimination in postmenopausal women

In this article, the theoretical distinction between recognition memory decision and discrimination processes is used to explore the effect of dehydroepiandrosterone (DHEA) in postmenopausal women. DHEA is an adrenal steroid that diminishes with aging. It has enhanced memory in laboratory animals. An 8-week placebo-controlled, double-blind experiment in which 30 women (ages 39–70) received a 50-mg/day oral dose of DHEA for 4 weeks demonstrated that DHEA made subjects more conservative (i.e., less likely to call test items “old”) in their recognition memory decisions and enhanced recognition memory discrimination for items presented briefly. The former result may reflect an empirical regularity (Hirshman, 1995) in whichrecent strong memory experiences make participants more conservative. The latter result may reflect the effect of DHEA on visual perception, with consequent effects on memory. These results suggest the methodological importance of focusing on decision processes when examining the effects of hormones on memory.     

Effects of soy lecithin phosphatidic acid and phosphatidylserine complex (PAS) on the endocrine and psychological responses to mental stress

Phosphatidylserine, derived from cow brains, has been shown previously to dampen the ACTH and cortisol response to physical stress. Further research investigated the influence of soy lecithin phosphatidylserine supplementation on mood and heart rate when faced with an acute stressor. In this study, we investigated the effects of soy lecithin phosphatidic acid and phosphatidylserine complex (PAS) supplementation on pituitary adrenal reactivity (ACTH, cortisol) and on the psychological response (Spielberger State Anxiety Inventory stress subscale) to a mental and emotional stressor. Four groups of 20 subjects were treated for three weeks with daily dosages of either 400 mg PAS, 600 mg PAS, 800 mg PAS, or placebo before exposure to the Trier Social Stress Test (TSST). Treatment with 400 mg PAS resulted in a pronounced blunting of both serum ACTH and cortisol, and salivary cortisol responses to the TSST, but did not affect heart rate. The effect was not seen with larger doses of PAS. With regard to the psychological response, 400 mg PAS seemed to exert a specific positive effect on emotional responses to the TSST. While the placebo group showed the expected increase in distress after the test, the group treated with 400 mg PAS showed decreased distress. These data provide initial evidence for a selective stress dampening effect of PAS on the pituitary-adrenal axis, suggesting the potential of PAS in the treatment of stress related disorders.     

Effects of psychological defense on processing of neutral stimuli indicated by event-related potentials (ERPs)

The Defense Mechanism Test (DMT) is claimed to identify personnel with a high risk for accidents. A new explanation for why the DMT seems to predict performance when survival depends on split second decisions is proposed. Sixteen right-handed, adult male students were tested with the DMT and with an ERP paradigm (two sine wave tones, presented binaurally). Each subject was tested with a one-stimulus paradigm, and a passive and an active oddball paradigm. Under the passive oddball condition, High defensive subjects differed from Low, having significantly smaller N2 amplitudes (low immediate perception), and significantly larger P3 amplitudes (rely on later associative mechanisms). High defensive subjects seem to have less ability to perceive the environment correctly immediately. This slowness may be fatal when life depends on split second decisions. The fundamental neurophysiological difference may also be the basis for the very complex cognitive and perceptual mechanisms involved in psychological defense mechanisms.     

The Toronto Alexithymia Scale (TAS-20): A measure of general psychological distress

The Toronto Alexithymia Scale (Bagby, R. M., Parker, J. D. A., & Taylor, G. J. (1994). The twenty-item Toronto Alexithymia Scale-I. Item selection and cross-validation of the factor structure. Journal of Psychosomatic Research, 38, 23–32.) is the most commonly used measure of Alexithymia (= difficulties identifying and describing one’s own feelings). Sixty-three persons (34 psychiatric inpatients, 29 healthy controls) first filled in the TAS-20 and were then interviewed about their interpersonal relationships. Two raters coded the emotional experiences that the participants reported during these interviews. Contrary to expectations, participants with higher TAS-20 scores reported more emotions (particularly negative ones), and more different emotions, questioning the validity of the TAS-20 as a measure of Alexithymia. Based on correlation patterns and a joint factor analysis with two well-established measures of psychopathology, it is concluded that the TAS-20 assesses a general psychological distress factor.     

Implementation of a mindfulness-based stress reduction (MBSR) program to reduce stress,anxiety, and depression and to improve psychological well-being among retired Iranian football players

ObjectivesTo test whether a mindfulness-based stress reduction (MBSR) program could reduce symptoms of anxiety, stress, and depression, and increase psychological well-being among retired Iranian football players compared to an active control group.DesignRandomized controlled trial, with an 8-week MBSR intervention (16 group sessions, 90 min each) and an active control group. Three data assessments were performed at baseline, eight weeks later after completion of the intervention, and again twelve weeks later at follow-up.MethodsForty male retired football players (M_age = 34.05, SD = 1.72) were randomly assigned either to the MBSR intervention or the active control condition. All participants completed questionnaires on perceived stress, anxiety, depression, and psychological well-being. Repeated measures analyses of variance were used to assess time by group interactions.ResultsSignificant time by group interaction effects were found for all outcomes. In the MBSR group, psychological well-being improved and symptoms of stress, anxiety, and depression decreased over time from baseline to intervention completion and to follow-up. In the active control group, the outcomes remained relatively stable across time.ConclusionsThe present findings suggest that among male retired Iranian football players, a MBSR intervention has the potential to reduce symptoms of stress, anxiety, and depression, and to increase their psychological well-being. Potential (underlying) mechanisms were not assessed in the present study. In future investigations, researchers should try to gain a deeper understanding of the mechanisms which may explain the observed effects.     

The assessment of surgery-related coping: The coping with surgical stress scale (COSS)

Abstract

Surgery can be regarded as a major stressor for any patient. High preoperative emotional arousal may negatively influence adjustment during surgery as well as the postoperative recovery rate. Consequently, the strategies individuals employ for coping with this stress are of prime importance for the quality of their adaptation. This paper reports the construction and empirical assessment of a new instrument for measuring strategies employed to cope with surgical stress. Factor analysis of this instrument, the Coping with Surgical Stress Scale (COSS), yielded five factors: Rumination, Optimism and Trust, Turning to Social and Religious Resources, Threat Avoidance, and Information Seeking. Internal consistencies of the corresponding subscales were satisfactory. Results concerning external relationships of the COSS with dispositional coping, state and trait anxiety, and indicators of perioperative adjustment showed that the COSS is a useful instrument for measuring surgery-related coping.     

Effects of fluency on psychological distance and mental construal (or why New York is a large city, but New York is a civilized jungle)

People construe the world along a continuum from concretely (focusing on specific, local details) to abstractly (focusing on global essences). We show that people are more likely to interpret the world abstractly when they experience cognitive disfluency, or difficulty processing stimuli in the environment, than when they experience cognitive fluency. We observed this effect using three instantiations of fluency: visual perceptual fluency (Study 1b), conceptual priming fluency (Study 2b), and linguistic fluency (Study 3). Adopting the framework of construal theory, we suggest that one mechanism for this effect is perceivers' tendency to interpret disfluently processed stimuli as farther from their current position than fluently processed stimuli (Studies 1a and 2a).     

The number of active sweat glands (PSI, palmar sweat index) in stress caused by blood donation

The number of active sweat glands (PSI), heart rate, systolic (SBP) and diastolic blood pressure (DBP) were assessed every 2 minutes in 109 male blood donors. Three measurements were taken at the beginning (adaptation phase), three later but before blood donation (baseline), one during the venous puncture (phase 3), three thereafter but still during donation (phase 4), and four after removal of the cannula (phase 5). Analysis of variance yielded significant differences between phases; PSI and SBP behaved similarly, decreasing from adaptation to baseline, rising during puncture, and decreasing again thereafter. Mean within-subject correlations between variables were significantly above 0. Between-subjects correlations were significantly negative for PSI and DBP. This is best explained by the influence of age on both variables. Correlations of PSI values as determined by three raters had a mean of 0.90. The study shows that the PSI is a very sensitive indicator of stress that is easily accessible also in field studies.     

The balanced measure of psychological needs (BMPN) scale: An alternative domain general measure of need satisfaction

Psychological need constructs have received increased attention within self-determination theory research. Unfortunately, the most widely used need-satisfaction measure, the Basic Psychological Needs Scale (BPNS; Gagné in Motiv Emot 27:199?C223, 2003), has been found to be problematic (Johnston and Finney in Contemp Educ Psychol 35:280?C296, 2010). In the current study, we formally describe an alternate measure, the Balanced Measure of Psychological Needs (BMPN). We explore the factor structure of student responses to both the BPNS and the BMPN, followed by an empirical comparison of the BPNS to the BMPN as predictors of relevant outcomes. For both scales, we tested a model specifying three latent need factors (autonomy, competence, and relatedness) and two latent method factors (satisfaction and dissatisfaction). By specifying and comparing a series of nested confirmatory factor analytic models, we examine the theoretical structure of the need satisfaction variables and produce evidence for convergent and discriminant validity of the posited constructs. The results of our examination suggest that the three need variables should not be combined into one general need factor and may have separate satisfaction and dissatisfaction dimensions. Our model comparisons also suggest the BMPN may be an improved instrument for SDT researchers.     

The use of the occupational stress indicator (OSI) in factory workers in China

The purpose of the study was to investigate occupational stress among Chinese factory workers (N=342), from three cities of South East China, using the shortened version of the Occupational Stress Indicator (OSI)-2. The results showed that the reliabilities and predictive validity of the OSI-2 subscales and other subscales used for the study were reasonably high. Quite a high percentage of workers perceived high work pressure. The main sources of stress were intrinsic to the job; and the coping strategies that were most frequently used to tackle stress were “control” methods. In addition, “satisfaction on environmental condition” seemed to be a common predictor for job satisfaction, and mental and physical well-being. The logical relationships between job satisfaction, mental well-being and physical well-being in Chinese workers have provided support to the findings obtained in Western countries.     

The utility of the Anxiety Disorders Interview Schedule (ADIS) in the diagnosis of post-traumatic stress disorder (PTSD) in Vietnam veterans

The ability of a novice interviewer utilizing the ADIS to make diagnoses of PTSD in Vietnam veterans with combat experience was tested in a sample of 43 cases. Agreement between ADIS diagnosis and a criterion diagnosis was found in 93.0% of cases (κ = 0.857), suggesting that the diagnostic category can be reliably identified and demonstrating the utility of the ADIS for ascertaining this diagnosis.     

The effects of shock intensity on fear incubation (enhancement): A preliminary investigation of Eysenck's theory

Rats were presented with three levels of shock intensity during acquisition followed by three levels of nonreinforced CS exposure during extinction (3 × 3) in the context of a one-way avoidance situation. Extinction effects were directly dependent upon the differential shock-intensity levels which were delivered during acquisition. Avoidance behavior was sustained and, in fact, increased (incubation) for high-shock groups despite increased duration of nonreinforced CS exposure. These results were interpreted as support for Eysenck's (1968) theory of fear incubation.     

The storm and stress (or calm) of early adolescent self-concepts: within- and between-subjects variability

This study uses intraindividual variability and change methods to test theoretical accounts of self-concept and its change across time and context and to test the developmental implications of this variability. The 5-year longitudinal study of 541 youths in a rural Pennsylvania community from 3rd through 7th grade included twice-yearly assessments of self-concept (academic and social), corresponding external evaluations of competence (e.g., teacher-rated academic skills, peer-nominated "likeability"), and multiple measures of youths' overall adjustment. Multiphase growth models replicate previous research, suggesting significant decline in academic self-concept during middle school but modest growth in social self-concept from 3rd through 7th grade. Next, a new contribution is made to the literature by quantifying the amount of within-subject variability (i.e., "lability") around these linear self-concept trajectories as a between-subjects characteristic. Self-concept lability was found to associate with a general profile of poorer competence and adjustment and to predict poorer academic and social competence at the end of 7th grade above and beyond level of self-concept. Finally, there was substantial evidence that wave-to-wave changes in youths' self-concepts correspond to teacher and peer evaluations of youths' competence, that attention to peer feedback may be particularly strong during middle school, and that these relations may be moderated by between-subjects indicators of youths' general adjustment. Overall, findings highlight the utility of methods sensitive to within-subject variation for clarifying the dynamics of youths' self-system development.     

To test or not to test: The status of psychological testing under the Americans with Disabilities Act (ADA)

The Americans with Disabilities Act (ADA) serves as a safeguard that employers are using only nondiscriminatory and valid selection measures. This article clarifies the point that preemployment psychological tests are not usually medical in nature and thus can continue to be used once the ADA becomes effective.     

Prevention of work-related psychological disorders. A national strategy proposed by the National Institute for Occupational Safety and Health (NIOSH)

The National Institute for Occupational Safety and Health (NIOSH) recognizes psychological disorders as a leading occupational health problem. This document, developed by a NIOSH working group led by the present authors, represents a first attempt to fashion a comprehensive national strategy to protect and promote the psychological health of workers. Roles are identified for industry, labor, government, and academia. Key initiatives include (a) steps to improve working conditions and employee mental health services and (b) increased research and surveillance to advance understanding of the problem. Because work-related psychological disorders appear to be a rapidly developing problem lacking complete definition in terms of scope and etiology, this strategy is not to be considered a final statement of NIOSH policy.     

Animalizing women and feminizing (vegan) men: The psychological intersections of sexism,speciesism, meat,and masculinity

Images of sexualized women depicted as animals or alongside meat are routinely used in advertising in Western culture. Philosophers and feminist scholars have long theorized that such imagery reflects the lower status of both women and animals (vs. men) in society and argued that prejudiced attitudes towards women (i.e., sexism) and animals (i.e., speciesism) are interconnected, with meat-eating as a core symbol of masculinity. Addressing these key ideas from ecofeminist theory, we review the psychological evidence on the associations between sexism, speciesism, meat, and masculinity. Research on the animalistic dehumanization of women provides evidence that sexism and speciesism are psychologically entangled and rooted in desires for group-based dominance and inequality. Furthermore, research on the symbolic value of meat corroborates its masculine value expressing dominance and power, and suggests that men who abstain from meat consumption (e.g., vegans) are feminized and devalued, particularly by those higher in sexism. We conclude that a greater recognition of the interconnected nature of patriarchal gender relations and practices of animal exploitation, including meat-eating, can help in efforts to improve the status of both women and animals.     

The discrimination of natural movement by budgerigars (Melopsittacus undulates) and pigeons (Columba livia)

Three experiments examined the ability of birds to discriminate between the actions of walking forwards and backwards as demonstrated by video clips of a human walking a dog. Experiment 1 revealed that budgerigars (Melopsittacus undulates) could discriminate between these actions when the demonstrators moved consistently from left to right. Test trials then revealed that the discrimination transferred, without additional training, to clips of the demonstrators moving from right to left. Experiment 2 replicated the findings from Experiment 1 except that the demonstrators walked as if on a treadmill in the center of the display screen. The results from the first 2 experiments were replicated with pigeons in Experiment 3. The results cannot be explained if it is assumed that animals rely on static cues, such as those derived from individual postures, in order to discriminate between the actions of another animal. Instead, this type of discrimination appears to be controlled by dynamic cues derived from changes in the posture of the demonstrators.